I am inquiring as to what you all think about the idea (reality?) of a 'flat earth' with borders that no one has ever been able to penetrate, and as I've read...is covered by a semi-dome.

After reading various opinions and so-called 'factual' statements from the "flat earth society" I'm not sure if the possibility of a 'grand elusion/deception' on such a large scale---- (such as other planets and such) is possible to pull-off?!?!?!?